Senior Frontend Engineer

Responsibilities

• Design and develop responsive, performant frontend applications using React and TypeScript
• Build scalable components, design systems, and testing frameworks for the payments platform
• Contribute to public SDKs and APIs to simplify blockchain payment integration for developers
• Collaborate cross-functionally with product, design, and engineering teams to solve user problems
• Drive technical excellence by improving performance, accessibility, security, and code quality
• Innovate on Web3 user experiences to make complex onchain actions feel simple and intuitive

Requirements

• 2+ years of experience building production frontend applications with React and TypeScript
• Strong proficiency in state management, API integration, and responsive design
• Proven expertise in performance optimization and writing clean, maintainable code
• A product-oriented mindset with a focus on delivering exceptional user experiences
• Ability to work onsite in San Francisco, CA or New York, NY

Preferred Qualifications

• Previous experience with blockchain technologies (EVM, Solana, or Bitcoin) and Web3 libraries like ethers.js, viem, or wagmi
• Background in building payment flows, checkout experiences, or financial products
• Full-stack capabilities including comfort working with APIs and backend services
• Strong design sensibility and experience implementing pixel-perfect interfaces
• Active participation in open source projects

Benefits

• Competitive compensation package including equity
• Unlimited PTO
• Visa sponsorship available for international candidates
• Significant autonomy to build next-generation blockchain infrastructure

About the Company

Halliday is a blockchain company and product lab working to create a unified, cross-chain payments ecosystem. Backed by a16z and Hashed, Halliday's flagship product, Halliday Payments, enables users to seamlessly onramp, swap, and perform onchain actions via the Workflow Protocol.